fixed tooltip visibility

src/main/java/cz/kamma/kfmanager/ui/MainWindow.java

@@ -2997,22 +2997,15 @@ public class MainWindow extends JFrame {
         }
 
         @Override
-        public void mouseEntered(MouseEvent e) {
+        public void mouseReleased(MouseEvent e) {
-            showWindow(e);
-        }
-
-        @Override
-        public void mouseExited(MouseEvent e) {
             tooltipWindow.setVisible(false);
         }
 
-        @Override
-        public void mouseMoved(MouseEvent e) {
-            updateLocation(e);
-        }
-
         @Override
         public void mouseDragged(MouseEvent e) {
+            if (!tooltipWindow.isVisible()) {
+                showWindow(e);
+            }
             updateLocation(e);
             updateDividerTooltip(splitPane);
         }